Oh, poor little one. You can use vapourub on her chest, everyone I know do and I did too when Dita had a cold. There are apparently some studies that say it can be unsafe, but my doctor says it's fine. I also dressed her in sleepsuits a size bigger than what she usually wears, let her sleep whenever she wanted to and gave her lots of milk. And of course making sure no room's too cold or too warm. Good luck! I hope little Persephone feels better soon!